Cutting torch



July 29, 1930. v G.C.QUVELCH I CUTTING TORCH Filed Aug. 25, 1926 Patented July '29, 1930 GEORGE C. QUELCH, OF OAKMONT,

of cutting 'IUNITXED STAT-ES PATENT OFFICE OXYGEN COMPANY, 01? NEWARK,

commune TORCH.

Application filed August 23', 1 26. Serial in. 130,887.

My invention refers to improvements in the class of torches or burners for the purpose ferrous metals by the application of a jet of high pressure oxygen, subsequent to theaction of a preliminary or preheating flame. A

The use of such torches is widely extensive, utilizing various gases as acetylene, hydrorocarbons, etc., With-oxygen for preheating, controlled by various valves. In certain standard constructions a lever'controlled valve is also utilized for control of the cutting oxygen supply, operable by the hand of theuser while holdin the torch.

In mg invention I provide a uel gas valve.

so com ined or associated with the valve- ,act-uating mechanism for the cutting oxygen supply, as to cooperate therewith to open the gas valve when the main oxygen supply is closed, and vice versa.

One preferred embodiment of the invention is shown in the accompanying drawings, in which:-' I

Fig. I is a view of a torchin side elevation provided with my invention;

Fig. 2 is an enlarged view of the valve mechanism at right angles to Fig. 1;

Fig. 3 is a longitudinal vertical section on the line III, III, of Fig. 1, further enlarged, showing the gas valve open;

Fig 4 is a partial similar view showing the gas valve practically closed;

Fig. 5 is a plan view corresponding to Fig. 1, with the covering and levers removed. .The torch as a whole comprises a head A having a burner tip 2, to which through suitable ports or ducts, are supplied the cutting oxygen by pipe 3, the preheating oxygen by pipe 4, and the fuel gas by pipe 5, as is well understood by those familiar with the art.

The main oxygen supply for pipes 3 and 4 is by connection 6, the pre-heating oxygen through pipe 4 being regulated by valve stem 7, the cutting oxygen pipe 3 being connected for full volume supply beyond saidv valve. Gas is supplied to conduit 5 by connection 8 regulated by valve stem 9. It will be understood that the valves and their stems 7 and 9 are located at any convenient posithe issuance of the mixture through ducts arranged around the usual central cutting jet opening.

I For the purpose of controlling the fiow of fuel gas through pipe 5, I provide said pipe, or the fuel gas conduit at any point, wlth the valve B adapted to remain normally open when circulation is opened through the gas line, and to be closed or practically closed in connection with the opening of the main oxygen supply through pipe 3 to the central duct of cutting tip 2.

Valve B comprises a casing as shown. having connecting lugs or sockets 13 for pipe 5, a central bore or chamber 14 for the movable valve head 15, and coniunicating cross ports 16 for circulation of the gas.

Plunger 15 is normally retracted to open position by spring 17, bearing against the valve head or plunger 15 at one end and against the terminal closing plug 18 at the other. Said plug is in threaded engagement with the end of the valve casing, as at 19, and may be accurately adjusted to vary the tension of the spring.

At the other end a stem 20 extends through the casing, with a suitable bushing and packing as shown, and a lever 21 is pivoted at 22 between bearing lugs of the casing, and ex tends inwardly underneath the oxygen valve lever 10, as in Fig. 2.

By su'ch construction and arrangement,

when the valve lever 10 is depressed to open' PENNSYLVANIA, ASSIGNOR '10 INTERNATIONAL NEW JERSEY, A CORPORATION OF NEW JERSEY isopened.-

sarily in the position shown,

The desired movementof the valve plunger 15 may be easily regulated by the length of arm 21 and its point of engagement with lever 10, with the desired leverage action against the re-acting spring 17.

By such construction and arrangement there is no loss of time or of either ox gen or gas. The preheating application 0 the fuel gas and oxygen is continued until the metal is raised'to the proper temperature,

when by the mere operation of the single lever 10 the fuel gas supply is automatically terminated or limited and the cutting oxygen supply is-simultaneously commenced.

Likewise, at the'termination of the cutting oxygen supply, if additional preheating is desired the torch is immediately ready for such further application, providing for continuous use without loss of time, so long as the main' supplythrough valves 7 and 9 is continued.

It will be understood, of course, that the particular location of valve B .is' not necesbut that it may be incorporated anywhere in the fuel supply line and in proper relation to the hand lever of the cutting oxygen supply for cooperation therewith. p

The invention may be otherwise changed or varied by the skilled mechanic orbuilder, to adapt it to different standard constructions of torch, or for other reasons,-and itwill be understood that the invention is not necessarily limited to the particular construction and arrangement shown.

Having described, my invention, what I claim is:

1. In a cutting torch, the combination with a cutting tip and head having passageways for delivering heating and cutting gases, a main oxygensupply conduit and a main gas supply conduit, a preheating oxygen conduit connected with the main oxygen conduit with an intervening valve, a cutting oxygen conduit connected with the main oxygen conduit with an intervening valve, a lever therefor,

\ a gas supply conduit connected with the main main oxygen supply conduit gas conduit, a se arable independently connected valve in the gas supply conduit having an outwardly projecting valve stem extension, extension and in operative relation to the lever of the cutting oxygen conduit valve.

2. In a cutting torch, the combination with a cutting tip and head having passageways for deli'vering'heating and cutting gases, a and a main gas supply conduit, a preheating oxygen conduit connected with the main oxy en conduit with an intervening valve, a cutting oxygen conand a lever therefor engaging said gaging ply conduit having an outwardly projecting extension, and a depressing lever therefor ensaid extension and extending inwardly against the lever of the cutting oxygen conduit valve under pressure of the spring re- I tracted stem of said-separate valve casing.

3. In combination, a cutting tip and head having passageways for heating and cutting gases,a main oxygen supply connection and a mam gas supply connection each having a separate controlling valve, a preheating oxygen pipe and a cutting oxygen pipe con-' necting the main oxygen supplyconnection with the head, a gas supply pipe connectin the main gas supply connection with the hea an independent valve casing connected at each side with the cutting oxygen pipe having a plunger, stem and an operating lever, a valve in the gas supply pipe having an extended stem, an operating lever engaging the said lever for closing t extended stem and the lever of the cutting oxygen valve, and a retracting spring in the casing normally pressing the plunger to open position and pressing its stem agalnst its operating lever. r 4. In a torch, the combination with a' cutting tip and head and a handle portion hav-' ing a main oxygen supply connection and a.

maingas supply connection, a preheating I and 'a cutting oxygen pipe connecting the oxygen supply connection with the head, and a gas pipe connecting the gas supply connection With'the head, of a chambered valve casing in the gas pipe line having ports communicating therewith, a plunger valve therein having an outwardly projecting stem and a re-actin'g spring, a depressing lever for the stem having a free terminal, and a control valve in the cutting oxygen pipe line having an operating lever engaging the terminal of I e gas supply valve when the oxygen supply valve is opened, the re-acting spring normally exerting pressure by the stem against its. depressing lever to hold it in contact against'the inner side of ting tip and head and a handle portion hav-- ing a main oxygen supply connection and a the lever .of the cutting oxygen corgrol valve.

5. In a torch, the combination with a' cutmain gas supp y connection, a preheating and a cutting oxygen pipe connectin the oxygensupply connection with the hea and a gas pipe connecting the gas supply connection with .the head, of a chamberedvalve casing in the gas pipe line having ports communicating therewith, a plunger valve therein movable across said:portslto vary their circulating area and having an outwardly projecting stem, a depressing lever forthe stem pivoted on the valve casing and having duit connected with the main oxygen condult a free terminal, a closing cap for the op it side of the casing. threaded therein, a spring between said cap and the plunger valve exerting' opening pressure on the valve and pressing its stem against said lever, and a control valve in the cutting oxygen pipe line having an operating lever engaging the terminal of said lever against the spring exerted pressure of the plunger valve stem.

' 6. The combination with a cutting torch m provided with an oxygen conduit and a gas conduit, and a valve controlling the oxygen supply having an actuating lever, of a valve controlling the gas supply having a retracting spring and a stem normally extended by said spring, and an actuatingarm for the gas supply valve engaging said stem and having a freely sliding terminal extending underneath and normally pressed by said spring against the oxygen valve lever for depression thereby to reduce the gas supply as the oxygen supply is lncreased.

n testimony whereof I hereunto affix my signature.

' GEORGE C. QUELCH. 

